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                [Poi2002]敌对球迷                </h1>
                <p>时间限制：1s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div style="text-indent: 21pt"><span style="font-size: medium">在一个信息王国里决定在两个敌对的球队：LINUKS和MICROSOFT之间举行球赛。由于两个球队的球迷结怨甚深，所以要将他们安排在两个距离尽量遥远的城市里，而且只允许他们从电视中看球赛。信息王国是个岛国，它所有的城市都建在海岸上。沿着海岛周边有一条双向的环行公路。有两种方法可以从每一个城市到达另一个城市：顺时针和逆时针方向。这条双向环行公路中较短的距离是城市之间的距离。</span></div>
<div style="margin: 7.8pt 0cm"><span style="font-size: medium">任务</span></div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 编写程序</span></div>
<div style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt"><span style="font-size: medium">&sup2;<span style="font: 7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;</span>输入海岛图形说明</span></div>
<div style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt"><span style="font-size: medium">&sup2;<span style="font: 7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>计算可以分隔敌对球迷的最大距离</span></div></p><hr/><h3>输入格式</h3><p><div style="margin: 7.8pt 0cm"><span style="font-size: medium">第一行中存储了一个正整数n，2&lt;=<i>n</i>&lt;=50 000,这个数字代表海岛上所有城市的数目。在接下来的n行中存储了相邻城市间环行公路的长度。每一行中包含了一个整数。在编号为I+1的行中存储了编号为I的城市和编号为I+1的城市之间公路段的长度，在编号为N+1行中存储了城市N和城市1之间路程的长度。环行公路的总长度不超过1 000 000 000。</span></div></p><hr/><h3>输出格式</h3><p><div><span style="font-size: medium">&nbsp;&nbsp;<code>第一行包含一个标明可以将球迷分隔最大距离的正整数。</code></span></div></p><hr/><h3>样例输入</h3><pre>5
1
2
3
4
5
</pre><hr/><h3>样例输出</h3><pre>7</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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